I've been using the various versions of 2.4, and somewhere between 2.4rc1 and 2.4.0 the source file comments have disappeared. I've tried to manually set them for the dev stage using SSViewer::set_source_file_comments(true); and also tried having out in the _config.php for all stages, and it's still not appearing. I'm sure it was there last week with rc2, but not 100% sure.
Any way to get this working again, it's one of my favourite debugging tools?!?!
just did a ?flush=1 and it's working again